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CHAPTER 5: OPERATING YOUR POWER SUPPLY
You turn on the voltage (VM) and power (WM) monitor similarly. In steps 2 and 3, you would
set VM = 1 for the voltage monitor or WM = 1 for the power monitor instead of IM = 1. The
high and low limit alarm events shown in the preceding illustration result in a TROUBLE signal
output at the I/O connector (see Appendix B) and an alarm message on the display screen (see
Appendix D) at the end of the weld cycle.
The operational events will depend on the setting that you specify for MR in the Mode Selection
display screen. On exceeding an upper or lower current, voltage or power limit, the following
will occur depending on the setting for MR (see Appendix B for the I/O connector definition):
MR = 0:
can be reset by the next START signal or a TROUBLE RESET signal input at the I/O
connector.
MR = 1:
accepted. The error state can be reset only by a TROUBLE RESET signal at the I/O
connector.
Current Setting Monitor (IP-217A Only). The IT-500A Welding Transformer has a
maximum current output capability of 2.0 KA. When it is selected, if you program 2.01 KA or
greater welding current, a current setting monitor will not allow the system to start. The display
screen will display the message CURR SET ERROR !! and the TROUBLE signal will be output
at the I/O connector. To remedy the error condition, you must either program a current setting
below 2.0 KA or connect a welding transformer with higher current output capability, and apply
a TROUBLE RESET signal at the I/O connector.
Monitoring Average Pulse Width. The control pulse activates the welding
transformer after the start of the weld cycle. Its width is a measure of how much time is left in
the duty cycle of the welding transformer before it will be damaged by exceeding its rated duty
cycle.
You view the average pulse width for Weld 1
and Weld 2 on the Average Pulse Width display
screen. For example, an average pulse width of
75% indicates that the transformer is operating
with a 25% margin of safety. To access this
display, press the MON. 2 key.
If the control pulse average width is 100% for
more than 5 milliseconds during the weld cycle,
a TROUBLE signal will be output through the I/O connector. The display screen will display the
alarm message FULL WAVE !!. Operation will be restored by the next START signal or
TROUBLE RESET signal input through the I/O connector.
IP-215A/IP-217A FINE SPOT WELDING POWER SUPPLIES
5-6
An END signal will be output through the I/O connector. The error state
No END signal will be output, so the next START signal will not be
993-603 REV A: October, 1995
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